The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 05, 2008
Filed:
Jul. 29, 2004
Xiaoxun Zhu, Marlton, NJ (US);
Yong Liu, Suzhou, CN;
Ka Man AU, Philadelphia, PA (US);
Rui Hou, Suzhou, CN;
Hongpeng Yu, Tianjin, CN;
Xi Tao, Suzhou, CN;
Liang Liu, Suzhou, CN;
Wenhua Zhang, Suzhou, CN;
Anatoly Kotlarsky, Holland, PA (US);
Sankar Ghosh, Boothwyn, PA (US);
Michael Schnee, Aston, PA (US);
Pasqual Spatafore, Marlton, NJ (US);
Thomas Amundsen, Turnersville, NJ (US);
Sung Byun, Cherry Hill, NJ (US);
Mark Schmidt, Williamstown, NJ (US);
Garrett Russell, Wilmington, DE (US);
John Bonanno, Woodbury, NJ (US);
C. Harry Knowles, Moorestown, NJ (US);
Xiaoxun Zhu, Marlton, NJ (US);
Yong Liu, Suzhou, CN;
Ka Man Au, Philadelphia, PA (US);
Rui Hou, Suzhou, CN;
Hongpeng Yu, Tianjin, CN;
Xi Tao, Suzhou, CN;
Liang Liu, Suzhou, CN;
Wenhua Zhang, Suzhou, CN;
Anatoly Kotlarsky, Holland, PA (US);
Sankar Ghosh, Boothwyn, PA (US);
Michael Schnee, Aston, PA (US);
Pasqual Spatafore, Marlton, NJ (US);
Thomas Amundsen, Turnersville, NJ (US);
Sung Byun, Cherry Hill, NJ (US);
Mark Schmidt, Williamstown, NJ (US);
Garrett Russell, Wilmington, DE (US);
John Bonanno, Woodbury, NJ (US);
C. Harry Knowles, Moorestown, NJ (US);
Metrologic Instruments, Inc., Blackwood, NJ (US);
Abstract
A method of determining the lower limit of decoding resolution in a digital imaging-based bar code symbol reader. A software-based optical design program is used to generate the composite DOF chart of image formation optics employed in the digital imaging-based bar code symbol reader. The modulation transfer function (MTF) of the object image is used to determine the smallest mil size code that can be decoded, at a given object distance, to produce an optical performance curve. The program calculates the size of the field of view (FOV) of a single sensor pixel, when projected through the image formation optics and out into object space. For both the 1.4 and 1.6 sampling limit pixel rules, the calculated FOV values are plotted on the same axes as the optical performance curve. Using graphical solution techniques, the sampling limit line of choice determines the lower limit of the decoding resolution in the imaging-based bar code symbol reader.